An ideal diesel engine has a compression ratio of 30. The air enters the cycle at 100 kPa and 20°C. The maximum temperature in the cycle is 2100 K. Compare this engine with an ideal Otto engine operating at the same conditions. in terms of thermal efficiency  in terms of mean effective pressure

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.